Conversion of PDFs to M3: files
I have noticed that a considerable number of references in my library which originally had a PDF attached, now have a yellow folder icon with a name starting with M3 followed by a series of numbers. This has nothing inside it, the PDF is gone, and there is no html snapshot either. Can you tell me what may be causing this?
see the link above ...
What this looks like is notes that have been created during import from RIS files, which have the DOI number in the M3 field.
I don't really see any way that Zotero would have produced this.